Report (4) -a - 0 fINIC - 3U - U4 I Ut UU; 1 I NH 1, U 1
LGI 2313 NEAlameda
Portland. Oregon 97212
(503) 287 -0511, Fax 282 -7671
March 30, 2004 Our ref; 04- 1945.075
Harvey Shore ? p 11 . 1 . ®F TIG ��®
16300 SW Copper Creek Drive Appro�led
Portland, Oregon 97224 " q ..... . . . . .. e ?(1 3r only the w p rk as described in: i 1
RE: GEOTECHN1CAL EVALUATION ` ��iMIT NO. .v aoo 77:7....
, See Letter to: Foll w ....... . [ , trach I PORTLAND, ORFOON
Date: Job Address: -- -... [ I '
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16300 SOUTHWEST COPPER CREEK DRIVE ._., . 2:1 Mr. Shore: � -fw -
We are pleased to present the results of our geotechnical evaluation of the
subsurface conditions at the settled chimney and corner of your house. The
property is located 16300 Southwest Copper Creek Drive, in Portland, Oregon.
We have proceeded with our report based on your verbal authorization.
We explored the subsurface conditions in the area of the settled chimney and
corner of your house. We advanced 2 borings to a depth of 12 1/2 feet using a one
inch diameter hand auger. In the two borings we encountered Medium Stiff,
Brown Clayey Silt (native).
Geotechnical Engineering Conclusions and Recommendations
We recommend the settled chimney and house foundations be underpinned to
support vertical loads. These and other related points are discussed in more detail
in the following paragraphs.
Underpinning Design
We recommend the settled chimney and house foundations be underpinned with
A. B. if Chance helical soil anchors or an equivalent method. The underpinning
anchors shall be capable of achieving the embedment depths and capacity
limitations presented below.
Bearing Material: Medium Stiff Silt
Minimum Tip Embedment: 12 ft below base of footing,
1INK - 3U - 1J4 I uC. UU; 16 Hi] r. UL
• 2 04- 1945.075
March 30, 2004
Maximum Tip Embedment: footingor as by the
geotechnical engineer.
Anchor Ultimate Capacity: 40 kips for Anchors
Anchor Proof Testing: 100 Percent of Design Load
Note: Underpinning anchors shall be installed according to manufacturers
published recommendations.
Anchor Proof Testing Procedure
All of the anchors and should be proof tested. The proof testing shall consist of
loading the each anchor in 5 equal increments to 100% of the design load. The
100% load should he held for 10 minutes. If the anchor movement between 1 and
10 minutes is less than 0.1 inches the anchor is acceptable, if the anchor moves
more than 0.1 inches the anchor should deepened and retested or abandoned and a
new, redesigned, replacement anchor installed.
Closure
This report has been prepared exclusively for the use of Harvey Shore for specific
application to this project. We are available to discuss any questions you may
have concerning this report.
Sincerely,
LW +®P. E ;
41 ,(Y, sf ‘.
®U®G N
3 90
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Craig C. LaVielle, P.E.,
• I IFfiC - JU - U4 I Ur. UU 10 till r. u3
March 30, 2004 3 04- 1945.075
SUMMARY TEST BORING LOGS
Depth (ft.) Soil Classification
Test Boring No. 1
0.0 — 12.5 Medium Stiff, Brown, Clayey Silt
(300 to 400 in -lbs. N =15)
Test boring was terminated at a depth of 12.5 feet. Seepage was not encountered.
Test Boring No 2
0.0 — 12.5 Medium Stiff, Brown, Clayey Silt
(300 to 400 in -lbs. N =15)
Test boring was terminated at a depth of 12.5 feet. Seepage was not encountered.
1Ili1( - U4 IU. Ua.10 1111 r. U4
March 30, 2004 4 04- 1945.075
16300 SW Copper Creek Drive Chimney Underpinning:
A.B. Chance Helical Anchors
Total Axial Load
Chimney Weight = 3' deep (15' highx135 unit wt)(3.5'wide) = 21,262 #
2 Helical Anchors at locations shown on sketch = 10,631 4/anchor
Install 8" & 10" Helical Anchors
Minimum embedment of 12 feet,
Load test to 10.6 kips or load required to lift footing which ever is lower. Lock off
anchor with a load of 10.6 kips or load required to lift footing which ever is lower
after load test.
16300 SW Copper Creek Drive House Underpinning:
A.B. Chance Helical Anchors
Total Axial Load 15 kips
.c/Helical Anchors at locations shown on sketch = 15 # /anchor
Install 8" & 10" Helical Anchors
Minimum embedment of 12 feet,
Load test to 15 kips or load required to lift footing which ever is lower. Lock off
anchor with a load of 15 kips or load required to lift footing which ever is lower
after load test.
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